SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3da808d53e016491489d087ab2c0d39f02873e2aa1833f968c5d633b1f4d8fdf' 
  AND token = 'w/tUhN7ZH2FFIwWRXF/B536B21JE/LM41K4m/V16+Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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