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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ad3fddf3405f6ac465040b69ac033e9d72f5c7ab2641cb49278a36156ad8706' 
  AND token = 'kHM9pw/ykgHin/oZH64s+NPAYlZ8nDoSwR4MS+YnCcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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