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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c04e94cfaa23f16d39cca5acecce5ddf32d4a7646844c30460a257a591bd326d' 
  AND token = 'EHFnYM5Hzc4b6jdrQGxOTn3PO4yi5SZqMTOxxUnRoQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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