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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '481938ea2494a9bde74ed321b6e6cc1f3a2eff25fd9d685093b54c4a05faa082' 
  AND token = 'ZJlcltUavVNHW8WtP1DT9jAEXiSoh5msw/uxxcGDxT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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