SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da0257f8266d78365719c26bf03d90e562957a40b3b54fbe1d063edb06bd62c5' 
  AND token = 'vhzdbHlhYYhZSVmnlpBq0gne8KSGaUbGw5Cgj/qIIIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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