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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9681c25b9c50e8cac389acffb6be2a107f415e76fb1912c668ea1ee075b998aa' 
  AND token = 'wRsYQgwBQ97QiKAv9u/wQKAqUH57XzfTt7bKBz/UBmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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