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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ba956e8795d66555a581d3a1417a7a2787dc14fb11a381331a39a8257591435' 
  AND token = 'OqJFkb9aa802QopwLS921nh4lEghtZPOggj50oKrMjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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