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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '249f8ade3e3f1370709b42869205cecc6b3de031f4a8ea2f3be5e9ac9941a100' 
  AND token = 'uYOyx27QuI9YhNHH2URNIW2uPE6bafrdaoLPfOHmZ0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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