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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df573fcee637775ddb30f00320cb48b9b9d04222350bb0c65b9aab4743e8dbe5' 
  AND token = 'qmg5Sh7IWOoQz9hBYhEurGejj3dI/Xqc/kU/kp7edI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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