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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d72ef0a55dfda0c819480af7ec19716d639434149c8345720bc0f65a2eb9966' 
  AND token = 'amZt6ZrvxNQEAp9xLvAo6jfW8jFgvl6Pa8k32nOfyOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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