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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b890816788330c73bb0db75a0ad228d4229144a408aa5ce50a1fcdff4708d876' 
  AND token = 'AyOMLss7SaS+cFT3oMtg2yDRFdsrlL8G9lhdkfRHYxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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