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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef40342328285a796dbdb1592c136e3487779eabf380ece10f3bf8dd4049e347' 
  AND token = '0R9K+rd9vYXD8I7kz7xyEG5G96EM19aVuHGBVw8tUh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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