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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '792da0d051209cddd35c7d29495893bb99e37f2dbd0d7821110bbc807a72931b' 
  AND token = 'dzkecYZDVhm0E3Va3vRh7DGUkTiRn5Gw2jWl7u/ymbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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