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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ad6d02e0977e78c5dd71d6fc49e64c0f0120a0703925a08cde9481884989a4c' 
  AND token = 'PkOJovW3RUEv9jqw5q8iy6UVTS4DmKY8LJDeFSXZq1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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