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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78fe85a28280a07b26184cb2156c467a08402c0250f9dbfd67bac8b7c5ba6d63' 
  AND token = 'asSS7t5yTA9P51EczbmJdjr8YW53HlQWc3Us+XfmqqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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