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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62f58cd6bd8b92642b225ac41bc3c84a36dc25ce7fee0b22d52399f035803647' 
  AND token = 'V5oell7h1eVlQMej21Qxsd9pFM4/WKw8lCthRRVfsuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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