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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '336323f03e9deccaaf28f6ea162a00a131f90417aeebfd9a0d2546d7f9014e92' 
  AND token = '09SMadJefKEJgLU7xkSYCZ2sAeWEFfkSKbOmtIBdf6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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