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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cab59f45137b39d62a2883a30fabd28b9e90a75355df40d6e8d8981e259bd739' 
  AND token = 'ekby8t1qpCiQ81AWcWlhKUjIbChCp4XVU7ghHT23Wfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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