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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7319b724c367af455cae721233acdb0f768e66f4c376d0b36066a370057c460' 
  AND token = 'Rwbkf882NGaHZ/tJAzBlPC8p99EREq6tR1dM6r921YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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