SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1d603363eb717e4dc168fd0acd7cc95e6f98b2be4ba251619e43307fb507fbc' 
  AND token = 'go0Fbve/EbEvCjSqhQjtwxDrSxaiojU87nFmKKLGVS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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