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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ffbeee77fa9bbd07abb52f6b5600e91c1ceafbcf1004d3cdbf3d08e9e2a2a27' 
  AND token = 'TfVyV1U1NwDC5MRqUaPfqm6tZYpxWSHplltkXJbPJD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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