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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e04c766f7824243c42c2a67f178255f94cf5b842b7452b371522bd9c9150a4ad' 
  AND token = 'Gf2wgRRrby1LUrY5sbup6LYZ9MmvArEQyPwELSVUyFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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