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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9241d256ef38d210ad92489d4bf6ab02e68c00ac93f329d19ec67a2dc0e99973' 
  AND token = 'ZuqidyPbXqhJKLdSuXO4IpYQoS51OYns7Lb9UliXE7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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