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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98a7d307de742e518c77ba564fb648babf4f4519b6debaa257e1af31cbfeb62d' 
  AND token = 'S1VAvogdxDADrWJpxiHppYguSvJoP+iH+0iJcAjGeag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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