SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7ef3cc3ff09312eccb155f0cd97b5f036a8de4043df7113279ea2ff280bd69c' 
  AND token = 'ndr8w+x+CpqtVW+ramCI/m/5l3EkzPGRylHy8Ev5ghI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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