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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c077edfc82bb3c9e09fae4e934ae37484b1f8b4bda7db89660d66157f373b527' 
  AND token = '0Cqsv5rmAlMpVvB4IfajsR5cSIX9jijiujK2YF7xmNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}