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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '531f3f7f4158986cf392711eeefd9b8cfbe93ff91d249ad2e5769d14cba6db1a' 
  AND token = 'rk2Tw1b61ip4ZxeG9y0jUnU4xx6GcOCtoYvCZxQlFoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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