SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c2df0faf464b93f78508f4b11ad140847677fcf6381f62a796bc21e2c88bfa5' 
  AND token = 'gaSlNx4oPq/0gyvvFkvTVIUrJJa080cMdXKMLqvZG50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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