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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16eaf1e139aba9243edc92c9c57696d77c20a93a3721e0a84a23f0ac20e993b6' 
  AND token = 'gImRh4ioPkGFm7wdnr/gnlZ4vyrIZIgzbCRe9PxqJ3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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