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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d10c97904bcbaf525dacab276a6085ad39c83be68bc246cf513f12ef635f0dc' 
  AND token = 'cLhTWi+W74StyVnGnKcOqbK0H3/5d7JwTNcrm9bhbjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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