SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b67a9b8d6988ef58ca18143a96a591b939c982a961ac94353c5d56fe87f267b' 
  AND token = 'jojdjQ+s+tuz3PmKrReWW0DVAz/BZUKYUho90nMJuBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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