SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '617525dcbd3952c3f6f40da9090f673eb7a9f3a527ccdc0448c07fd391925804' 
  AND token = 'gHnVtsY/IAO4q1I2iX+4C4A1zmQkDCjyCYCdBF7MD4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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