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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52055afee1b0746ef33f8ede816a8ac6e7b4a58e9a7a7aafbf35648db5438f94' 
  AND token = 'EWQBOSKJ2/hhhBBeXQxsfwdRuyoHgBTW73nVyalHF3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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