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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cc20c762d846ed4799aacefec0057d7ff5afa0e952c2edaf06c6cd7f84efaab' 
  AND token = 'MPf1K2ckpp26FvHmMRYdyCuGBtej3WXktO0oAveT2fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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