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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37882c67c186578076e737755942b39ade1431efcda3f26fe5d8e35b03387041' 
  AND token = '98/Mgli1CgVRC8r54fCa4OlJVga9xGp4XN2PVB3QCh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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