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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '350bdad3ed50d941c35788ccbd9e2f6631ebe592a4978d1ea30cfb354eb1bc96' 
  AND token = 'TSz+RvRHB0LoWn/xHncTCR0cHjK5la55eqk9HiUfl2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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