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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f535c0611163e85adeca926215d82acc76f539e3580f77821ebd5da738e65d1' 
  AND token = 'TmOjxnV8GyMG7VaArUpxl4qYXYQlt65oK6W06eBcevE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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