SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '449c18e4b1b6913b9521ab130f5702a493f975a0a1895216f7a454e3fbf6a566' 
  AND token = '/49Rnl44Y7PmLMtjVviV9FQ+hvdRSVXmkjjGQ/g2hHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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