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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '730c8de1ce99d6598545e8e1b302f5fc03d8f437dfbe7c4d5d5fa11adb89e589' 
  AND token = 'bU85PgBtuVYA/NUHQY24e1i09MGM3V8gz6Bcdzjtzas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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