SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9406c794fc82477ffc70d99b1ba7b06386be34f2fef1f1312f51bf64c94afa50' 
  AND token = 'QROxThsgV1BTIZ/UvegsIBU3mKtrYcxRXf9oUBFwD5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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