SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ffdd1d58c531b9a447e72a21c28278ec54f6ec0b7ba48a3e281242ee6f77e0c' 
  AND token = 'NKKxz3qs4jIPqddP0Fr2GigBeHV8Tw3bLUhYUA8Y0qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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