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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b1983d533e9d7d059702212f4f6cbb081d7d210262e789823ba46cc0688ed54' 
  AND token = 'IfnEYyXhRX854k9ONdlLhWWRrLhsmZ7B9wz9I19MBMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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