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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cda346f1bc0886c1fad81e3dbbf45c94c53e3ac0d4c69a75c3d2169f66b4dcf' 
  AND token = 'vcQI4IBpYAexHjcZbbhWqqR2NhVzycWQjOpvF5caOQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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