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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e06c0a1b4ed1b7bcf464c31b826f30a5da47129b1184f02980ab60466691f7f' 
  AND token = 'P0d9AKvUrjb37jcWVadqfCvqKQR7SBK5ue4ts75lmik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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