SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5fac39628442f8f90f4511d26402d77ba105586533e3edb7a472048c73445a3' 
  AND token = 'yJS45T6ihiLZo06/N9z+P5S839iIgTwSmjOuRZFEs9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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