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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '341e4df8068968e875b3725e2814126400332de6e7b28390b300503b703b6ee3' 
  AND token = 'XYYoeC8xhWWv1pfTFNd5Oc5ttXt0YG1HB/1doQwzego=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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