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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4809bee6242e5f17bc6a62d333924ea7e07de523a77ac7627d1db8225387a8d' 
  AND token = 'ESu5PqKFNnUv8E3G69NDwIf9cyYI4ho2tBseMFOqANU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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