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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7835d7892d4f504da66e04a913a514b277304d07cf64ef98c84d0ca7cacf687e' 
  AND token = '0kvtUtOQCiMPBzF3d0E3mb4eRCtBU0rwIf1Ft8w/QMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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