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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2208580686cc82f6717b259ca46c0c1fe35e5a4acb6d525680069bbb5934c703' 
  AND token = 'etmhi4lGlxbh325YtZ/EflZg41R9VZDRotWRfArwAnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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