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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '697e5e3318321ebb9f7acf0d58eef572b5ba0ef5d91ccce2332ee13b3a2f8fda' 
  AND token = '2ZJw1OGCofz3vZ8PX3wJ9t07J/8mmQGOQ38fdzFBS38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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