SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60319614fc52c3666424968f5e9bb20844816340e66fa049cff74b0e87a21a67' 
  AND token = '5fTvdY4SxN97M7OzMf9cBj4TZZG4hY+qHWoOmD+wO+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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