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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '143084ef687380f3b99586e3b56196971b688038bddd71dcaa41227ab05226d7' 
  AND token = '57Upa2qut0lOlhizSlwT5alT3MKax8LGz5V2slzVBH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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