SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9883458c82a9938d8fd0de7667f914ab3dc350de085da27f2bdb87c651f1bd4b' 
  AND token = '76gJYTvD/oWDz1bDZT2s/J7yLSz9azUXWptCGYhGOD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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