SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56eed8dec859f2e3409e8b5d2e58afe2dcbff58e383ea7c55065613531b0d6b7' 
  AND token = 'N69zAdgtRqA1sEBEjjFGKK0yLw4ny+AUpCruHGBmVhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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