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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f69feaa48bc13fd2034dbdcce519cb88c323da6e4b852a906326b6e91c495fd4' 
  AND token = 'WIdZmf8iAtg3mi62KsEB0gKc3WKJq4Y+abNT4rCYgv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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