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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02d6710825b3b76e1428c3431588da5deaa81cf24b7c80c15222d65a652c99ab' 
  AND token = '22U6Der6RrFctH/GZD4LqFnX6ojLi0Eo2Hnp+FUDvZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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