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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21209ce20b3023afbdd83b6d29cd66eb7fb6f6e5a2cd94e59ca37082386effb8' 
  AND token = 'gjiMkGAfJMDoCexYtpJeuJSgWfG5vkMeZu2hyLpT5gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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