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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0dcaf210779b93681fbaf1c17d2c262a6967b9041cff098c3efd867d802159a3' 
  AND token = 'EbJMZHflzl73TleQd55YZO1o9Bgm6xOxL8W/qvauuSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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