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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40eebec15b54acdad7ab0caf3600b91714add95effbcee2db0c39a987f5f4496' 
  AND token = 'WxGSqFwU0ioSAf+MbX3wocHfPM3s4Lv6V1FwRyXmdKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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